Depends on temperature, length of beer line, and recipe. A bit of experimentation might be required. Try starting with a long length of 3/16 beer line, say 7m.Ahhh thanks, been wondering why my pilsner at 10psi has been feeling undercarbed. It's perfect for a bitter as you say. I'll crank it up to 18 and see if that helps.
Do you have any foaming issues at 27psi?
My Pilsner has no issues, the saison needs to settle and then needs a top up. The raspberry sour is all foam, I think I need a longer length of beer line for that one.